public class Example21 {
    public static void main(String[] args) {
        int sum1 = add(1, 2);
        int sum2 = add(1 ,2,3);
        double sum3 = add(1.2 ,1.3);
        System.out.println("sum1 ="+sum1);
        System.out.println("sum2 ="+sum2);
        System.out.println("sum3 ="+sum3);
    }

    public static int add(int x, int y) {
        return x + y;
    }

    public static int add(int x, int y, int z) {
        return x + y + z;
    }

    public static double add(double x, double y ) {
        return x+y ;
    }
}